linux-kernel - Re: [PATCH] Add a file named cgroup.procs

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Date:   Fri, 4 May 2018 10:31:47 -0700
From:   Greg KH <gregkh@...uxfoundation.org>
To:     zhangq95 <qiangzh.hust@...il.com>
Cc:     linux-kernel@...r.kernel.org, tj@...nel.org, lizefan@...wei.com,
        hannes@...xchg.org, mingo@...hat.com, peterz@...radead.org,
        cgroups@...r.kernel.org, riel@...hat.com, gs051095@...il.com,
        akpm@...ux-foundation.org, oleg@...hat.com, tglx@...utronix.de,
        keescook@...omium.org, longman@...hat.com, prsood@...eaurora.org,
        guro@...com, davem@...emloft.net, mhocko@...e.com,
        kirill.shutemov@...ux.intel.com, marcos.souza.org@...il.com,
        hoeun.ryu@...il.com, rostedt@...dmis.org, bigeasy@...utronix.de,
        alexander.levin@...izon.com, paulmck@...ux.vnet.ibm.com,
        fweisbec@...il.com
Subject: Re: [PATCH] Add a file named cgroup.procs_stat in cgroup

On Fri, May 04, 2018 at 10:28:20PM +0800, zhangq95 wrote:
> When I run "cat /proc/stat" in a container, container will access
> host's file directly which is a security risk.

Why is this a "security risk"?  What can be learned there that is
somehow "bad"?

thanks,

greg k-h